If you're really new to photography and don't know about the aperture/shutter speed/ISO triangle then the best thing to do is invest in a copy of Bryan Peterson's excellent book Understanding Exposure. Quick and easy read, it will teach you the basics of exposure which is one of the most fundamental issues of photography. It's no exaggeration to say that once you understand the basics of exposure, a whole new world of creativity awaits you and your camera.

As far as your photos are concerned, you are doing most important thing right straight off which is getting out and about with your camera and taking photos in different situations. As far as I'm concerned that's the only way people improve their photography.

Good luck. I agree that this thread should be in the digital photography sub-forum

I have to say I love the 2nd and last photos, although the 2nd one could've done with a faster shutter speed, but if it was low light it's kinda tough.

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I hear you on the faster shutter speed on the waterfall photograph so the waterfall is frozen as presently it looks blurred. However, I would say the opposite and suggest that some of the best waterfall photos have been those where the motion of the water has been captured in a long exposure shot. Obviously though these photos are tricky to do and require tripods and ND grad filters so probably not something for someone new to photography

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